[S2GRAPH-226] Provide example spark jobs to explain how to utilize WAL log.

JIRA:
  [S2GRAPH-226] https://issues.apache.org/jira/browse/S2GRAPH-226

Pull Request:
  Closes #182

Author
  DO YUNG YOON <steamshon@apache.org>
diff --git a/CHANGES b/CHANGES
index bdc3da4..56b78fe 100644
--- a/CHANGES
+++ b/CHANGES
@@ -105,6 +105,7 @@
     * [S2GRAPH-219] - Added query that includes all vertices and associated edges for GraphVisualize.
     * [S2GRAPH-222] - Support Not logical operator in WhereParser.
     * [S2GRAPH-223] - Support WhereParser on Vertex.
+    * [S2GRAPH-226] - Provide example spark jobs to explain how to utilize WAL log.
 
 ** Task
     * [S2GRAPH-162] - Update year in the NOTICE file.